Abstract
An analysis of the two-pole compensation technique used in three-stage linear audio amplifiers is presented. An expression for the loop gain of a linear amplifier incorporating two-pole compensation is derived, allowing the designer to easily select the unity loop gain frequency and zero location by choosing appropriate values for the compensation components.
Also presented is a simulation method that allows the designer to observe an amplifier’s closed-loop and loop gain responses in a single pass without requiring modification to the circuit’s feedback path; and two separate modifications to the usual two-pole compensation approach which improve phase margin and significantly enhance negative-rail power-supply rejection ratio.
Also presented is a simulation method that allows the designer to observe an amplifier’s closed-loop and loop gain responses in a single pass without requiring modification to the circuit’s feedback path; and two separate modifications to the usual two-pole compensation approach which improve phase margin and significantly enhance negative-rail power-supply rejection ratio.
| Original language | English |
|---|---|
| Title of host publication | 129th Convention of the Audio Engineering Society |
| Place of Publication | San Francisco |
| Number of pages | 11 |
| Publication status | Published - 4 Nov 2010 |